Ptdv

[mikeo1210]

I purchased a pass-to-drain valve from you a few weeks back and had some questions about it.

I've been making a lot of water lately but today noticed my tds has creeped up a bit. Inspecting the valve I'm having a hard time determining whether or not it's doing anything.

When I shut off the product water, it pressurizes and I hear the valve click. When I turn it back on the product water immediately starts flowing again and never seems to bypass the DI. It was my understanding the DI would be bypassed for five minutes every time the product is shut off.

I'm shutting the product off after the bladder and tried it once w/ the bladder disconnected. How do I know if it's working? Any help would be much appreciated.

[SpectraPure]

Hi Mike,

Sorry I didn't get to your private e-mail eariler today. Plus, I really didn't have a quick answer for you without asking some more questions.

>>>When I shut off the product water, it pressurizes and I hear the valve click. When I turn it back on the product water immediately starts flowing again and never seems to bypass the DI. It was my understanding the DI would be bypassed for five minutes every time the product is shut off.

I need to know what the controlling device is -- what actually turns the water on and off?

Did it ever work properly?

Does it work once and then seem to mis-behave?

There is a 2-minute delay when the RO system shuts off for the optional concentrate bypass valve to do its thing. If you are immediately turning it back on, it won't have time to finsih the timer routine, so the PTD valve is probably re-activated.

I await your response,

Scott
SpectraPure, Inc.

[mikeo1210]

Scott- Just figured maybe this was easier then email. Didn't mean to take it public.:)

The controlling device is typically a spectrapure float switch. I was testing it by manually shutting it off via ball valve.

I waited two + minutes. When it's switched on the product water starts right up. I'm expecting to see a pause in production while it bypasses. Am I wrong in expecting this? It's never paused so it might not have ever worked correctly.

[SpectraPure]

Actually, the controlling device is probably an ASO Valve.

When, after being off for a while, you drop the float valve, the product water should be diverted to the drain side for 5 minutes.

This does not work?

Is the pressure switch in the black line JUST before the membrane and after the ASO Valve?

One other customer had so much restriction in the waste line, that we needed a bigger check valve to overcome the increased head pressure. We'll try that next.

Scott
SpectraPure, Inc.

[mikeo1210]

Originally posted by SpectraPure
Actually, the controlling device is probably an ASO Valve.

You're right. My bad.

When, after being off for a while, you drop the float valve, the product water should be diverted to the drain side for 5 minutes.

This does not work?

That's what I thought and no it does not.

Is the pressure switch in the black line JUST before the membrane and after the ASO Valve?

Yes, the pressure switch is just before the membrane and after the ASO.

[mikeo1210]

Originally posted by SpectraPure
Actually, the controlling device is probably an ASO Valve.

You're right. My bad.

When, after being off for a while, you drop the float valve, the product water should be diverted to the drain side for 5 minutes.

This does not work?

That's what I thought and no it does not.

Is the pressure switch in the black line JUST before the membrane and after the ASO Valve?

Yes, the pressure switch is just before the membrane and after the ASO.

[SpectraPure]

If you are unable to call tomorrow and talk during biz hours, send me an email to [email protected] and I will send you my cell phone number.

Scott
SpectraPure, Inc.